Abstract
Silica–wollastonite xerogel composites (xerocomposites) with different wollastonite filler content were obtained after classical drying of silica–wollastonite gels. Two different silica precursors were used, TEOS and colloidal LUDOX, for composites named TW and LW, respectively. We utilized SAXS experiments, N2 adsorption–desorption, and SEM techniques to determine the textural and structural properties of these porous materials. For both the TW and LW composites, it was shown that a macroporosity and a mesoporosity coexist. We argue that the proportion of macroporosity directly depends on the proportion of wollastonite fillers in the composite. We propose a unique two-stage drying mechanism to explain the formation of macropores. We additionally found that the surface of wollastonite fillers was covered by a dense multilayer packing of silica colloids in LUDOX LW xerocomposites. We believe that these surface-modified wollastonite fillers could improve the carbonation kinetics of wollastonite when used as a precursor for aqueous mineral carbonation, a promising route for safe and durable carbon sequestration.
Highlights
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Silica–wollastonite xerogel-composites (xerocomposites) were prepared.
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TEOS–wollastonite and LUDOX–wollastonite xerogels show porosity at two different scales, a macroporosity and a mesoporosity as confirmed from macroscopic and N2 adsorption–desorption measurements.
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SAXS, SEM, and N2 adsorption–desorption measurements reveal that the wollastonite filler surface is covered by a dense coating of silica colloidal particles in LUDOX–wollastonite xerocomposites.
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28 March 2019
The original version of this article unfortunately contained a mistake. The Figure 1 was inadvertently duplicated in the source file, the same has been processed and published as Fig. 2. The correct Fig. 2 is given below.
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Acknowledgements
This article is a special tribute to the memory of our friend, colleague and mentor, Professor Jean Phalippou. The authors are also very grateful to David Bessières and Marina Hild (“Nanostructured materials for a sustainable development” Franco-Venezuelian PCP program) to Claude Castro-Gimenez from the French Embassy in Venezuela and the FONACIT (Venezuela) for their financial support and encouragements.
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Larreal de Hernandez, L., Anez-Borges, L., Woignier, T. et al. Surface and porous textural properties of silica–wollastonite composites prepared by sol–gel process. J Sol-Gel Sci Technol 90, 113–125 (2019). https://doi.org/10.1007/s10971-018-4874-9
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DOI: https://doi.org/10.1007/s10971-018-4874-9